32blit

* Add support for PIC reloc'd binaries with RELO header
* Add string arg support for asset filename to cmake tool

* Add autoreset from game to firmware when running `flash save`
* Add `flash info` to determine if in game or firmware
* Add metadata dependency output from cmake tool
* Fix asset dependency output to include additional files like palette
* Redirect errors to stderr
* Quiet! Use -vvvv for info, warnings, errors and debug information.

* Add metadata tool - tags binary with metadata from a .yml file
* Fix relative paths for packer palette files
* Add support for subdirectories to `32blit flash save`

* Font tool (thanks Daft-Freak)
* Flash command with multi-target function (thanks Daft-Freak)
* Bugfixes to palette handling (thanks Daft-Freak)
* Bugfixes to package recognition (seemed to affect Python 3.8 on Windows)
* Friendly (ish) error message when a .tmx tilemap with 0-index tiles is used (tmx is 1-indexed for valid tiles)