Gw2buildutil

- update for Secrets of the Obscure
- makefile: add `distclean`

- update for End of Dragons
- fix bug: makefile didn't respect `prefix` and installed readme to the wrong
location
- `buildmod`: new module
- `build`:
- **breaking**: adjusted `GameModes` entries
- `api`:
- add `entity.Boon`, `entity.Condition`, `entity.CC` and `entity.Effect`
- `entity.Profession`: add `can_wield_type` method
- `entity.Skill`:
- fix bug: mech command skills were not available
- fix bug: some conjure weapon skills were not indexed by extra IDs,
such as `earth shield 5`
- fix bug: some engineer toolbelt skills were not indexed by extra IDs,
such as `grenade kit toolbelt`
- fix bug: some elementalist weapon skills were not indexed by extra
IDs, such as `dagger fire 4`
- add `Skill.attunement` and `Skill.dual_attunement`
- entities are now indexed by extra IDs:
- conjure and preparation skills, e.g. `earth shield`,
`thousand needles`
- Portal Entre by `portal`
- weaver dual attunement skills, e.g. `staff fire earth 3`,
`dagger fw3` (this also fixes a conflict with normal weapon skill
3 IDs)
- fix bug: `api.crawl` ignored the `full_recrawl` argument when not given a
`storage` argument
- `textbody`:
- **breaking**: change `RenderFormat` values to be render functions (first
argument to `Renderer`) rather than `Renderer` instances
- add renderer options
- add `heading level` option to `RST_HTML` renderer

- `build`:
- **breaking**: remove `MarkdownBody`
- add more trait stuff: `TraitTier` (`TraitTiers`), `TraitType`
(`TraitTypes`), `TraitChoices.from_api_id`
- `api`:
- add `entity.Trait`
- `entity.Entity`: add `extra_entity_relations` method for overriding
- `Skill` entities are now indexed by extra IDs:
- weapon skills, e.g. `pistol 4`, `gs 3`, `dagger earth 5`,
`elixir gun 4`, `staff ambush`, `sword stealth`, `sword dagger 3`
- profession skills, e.g. `f3`, `scrapper f5`
- engineer toolbelt skills, e.g. `elixir h toolbelt`, `bk tb`
- legend skills, e.g. `assassin heal`, `jalis elite`
- `entity.Skill`: add `is_flipover`, `filter_is_main`, `profession`
- `Profession` and `Specialisation` entities are now indexed by abbreviated
IDs, e.g. `necro`, `holo`
- `storage.Storage.from_id` can now be called with multiple entity types
- **breaking**: change `entity.RevenantLegend` attributes to methods:
`heal_skill`, `utility_skills`, `elite_skill`
- **breaking**: move `Filters` from `storage` to `util`, and change
constructor to require instances of the new `util.Filter` class
- **breaking**: some entity filters are now static methods instead of class
attributes: `Skill.filter_has_build_id`, `Skill.filter_is_main`,
`Stats.filter_endgame`, `Stats.filter_not_mixed`
- `textbody`: new module
- `defnfile`:
- parse `usage` and `notes` sections

- `build`:
- perform a lot more validation when constructing instances
- add `SkillType` and `SkillTypes`
- throw `BuildError` instead of `ValueError`
- **breaking**: remove aquatic weapon types until they're properly supported
- `api`:
- `entity.Profession`: add `can_wield` method
- `entity.Skill`: add `type_`, `professions`, `elite_spec`, `weapon_type`,
`is_aquatic`, `filter_has_build_id`, `filter_profession`,
`filter_elite_spec` and `filter_type` attributes
- `entity.Stats`: add `filter_endgame` and `filter_not_mixed` attributes
- **breaking**: remove `entity.Entity.from_api` - now implement using
subclass constructors
- **breaking**: remove `entity.Entity.filter`
- **breaking**: change `filters` argument to `storage.Storage.from_id` to a
`storage.Storage.Filters` object
- `defnfile`:
- allow skill abbreviations that were previously ambiguous by filtering to
the current context (uses skill type, profession and elite spec)
- `buildtemplate`:
- fix bug: parsing would set `BuildMetadata.elite_spec` to a
`SpecialisationChoices` instance instead of a `Specialisation` instance
- implement `__str__`, `__repr__`, `__eq__` and `__hash__` where appropriate for
classes in `build` and `api.entity`

- `buildtemplate`: new module
- `api`:
- add optional `filters` argument to `Storage.from_id()`, and improve
default lookup behaviour
- schema version:
- send version in requests
- store version in storage
- clear storage when crawling with changed version
- **breaking**: remove `storage.Storage.exists()`
- **breaking**: remove `non_unique_ids` argument from `Entity()`; remove
`aliases` attribute from `Entity`
- add `entity.RevenantLegend`
- **breaking**: moved from an enum in `build`
- add attributes: `build_id`, `heal_skill`, `utility_skills`,
`elite_skill`
- `entity.Profession`: add `build_id` attribute
- `entity.Skill`: add `build_id` attribute, `from_build_id()` static method
- **breaking**: `entity.Entity`: change `from_api()` argument order
- `build`:
- add aquatic variants for skills, legends and pets
- **breaking**: for ranger, `Intro.profession_options` is now
`RangerOptions` instead of `RangerPets`
- `defnfile`:
- parse some text more accurately
- map errors to `ParseError` in more cases
- use a logger

Initial packages:
- `defnfile`: build definition file parser
- `api`: simple API crawler and interface
- `compositions`: raids compositions generator