Rework of qmk compile

[skullydazed]

Description

In draft mode so people can try it out. Feature complete but refactoring to do still.

This adds a new feature to qmk compile: -f <filter>. A filter is a key/value pair that lets you select what to compile instead of using -kb all. They key is dotted json notation, which you can get using qmk info -f dotted -kb <keyboard>, which makes use of the new dotted format.

Example #1, compile all arm boards:

qmk compile -km default -f processor_type=arm

Example #2, compile only arm boards that use the QMK_PROTON_C board definition:

qmk compile -km default -f board=QMK_PROTON_C

Example #3, compile my keymap on every keyboard that supports rgblight:

qmk compile -km skully -f features.rgblight=true

The other major change this makes is to bypass the top-level Makefile to use build_keyboard.mk directly. This is a stepping stone towards doing qmk multibuild with a prettier UI.

Changelist:

• New argument for qmk compile: --filter
• New argument for qmk compile: --target
• We now use build_keyboard.mk directly instead of going through Makefile

Known Bugs

(Checked means it's been fixed.)

• qmk flash is still the old behavior
• It can take a while to search all the info.json files

Types of Changes

• Core
• Enhancement/optimization

Checklist

• My code follows the code style of this project: C, Python
• I have read the PR Checklist document and have made the appropriate changes.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• I have tested the changes and verified that they work and don't break anything (as well as I can manage).

[stale]

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[tzarc]

Split out as qmk mass-compile as per #18971.