Xerparser

Added

* Added `actual_total_cost` property to `TASKFIN` class
* Added `late_start` property to `PROJECT` class

Changes

* `TASK` method `rem_hours_per_day` can now accept a `late` flag (bool) to calculate late dates rather than early dates.

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General Notes

Refactor / cleanup code.
Working on functionality to generate cost loading projections.

Added

* Added `rem_hours_per_day` method to `TASK` class. This return a dict with date: workhour key value pairs. This function was originally contained within the `calendar.py` module, but was not being used. Makes more sense to have it as a `TASK` method.
* Added `base_calendar` attribute to `CALENDAR` class. The `is_workday` function will now search the `base_calendar` for holidays when determining if a date is a workday.

Changed

* `remain_drtn_hr_cnt` attribute of `TASK` no longer allows `None` type.
* `finish` property of `TASK` will now check for `reend_date` and return it before it returns `early_end_date`

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General Notes

Added parsing of User Defined Fields (UDF). [Issue 4](https://github.com/jjCode01/xerparser/issues/4)
Expanded testing for more coverage.
Refactor / clean up code for initialization of `XER` class.

Added

* Added class `UDFTYPE` which represents a User Defined Field.
* Added attribute `user_defined_fields` to `PROJECT`, `PROJWBS`, `RSRC`, and `TASK` classes, which hold a dictionary of `UDFTYPE`: `UDF Value` key value pairs.

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General Notes

Added parsing of Project Codes. [Issue 3](https://github.com/jjCode01/xerparser/issues/3).

Added

* Added class `PCATTYPE` which represents a Project Code Type.
* Added class `PCATVAL` which represents a Project Code Value.
* Added attribute `project_code_types` to `Xer` class, which holds a dictionary of `PCATTYPE` objects.
* Added attribute `project_code_values` to `Xer` class, which holds a dictionary of `PCATVAL` objects.
* Added attribute `project_codes` to `PROJECT` class, which holds a dictionary of `PCATTYPE`: `PCATVAL` key value pairs assigned to a project.

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General Notes

The `ScheduleWarnings` class will no longer be developed under this project. This is a breaking change if you were using the `ScheduleWarnings` class.

Added

* Added `__len__` method to `CALENDAR` class. Returns number of workdays in a week.

Removed

* Removed `warnings.py` from project. This may become a seperate project.

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* Added `default_calendar` attribute to `PROJECT` class.

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