The targets will only format files that have been changed in current
branch compared to the master branch. This includes unstaged, staged and
committed files.

Add following make and cmake targets:
formatc   - format changed c files
formatlua - format changed lua files
format    - run formatc and formatlua

Remove scripts/uncrustify.sh as this deprecates it.

This will ensure less verbose output and faster linting.

Problem:
Dirs "config", "packaging", and "third-party" are all closely related
but this is not obvious from the layout. This adds friction for new
contributors.

Solution:
- rename config/ to cmake.config/
- rename test/config/ to test/cmakeconfig/ because it is used in Lua
  tests: require('test.cmakeconfig.paths').
- rename packaging/ to cmake.packaging/
- rename third-party/ to cmake.deps/ (parallel with .deps/)

* build: move the logic for linters to cmake
Cmake is our source of truth. We should have as much of our build
process there as possible so everyone can make use of it.

* build: remove redundant check for ninja generator
The minimum cmake version as of writing this is 3.10, which has ninja
support.

I get a weird error about syntax.vim not being installed when using
--clean when running it locally.

- fix regression where `-j` is not passed to ninja
  (39c886551bf8323b63938f5dee5beb650c61f02b, #15708)
- enable to pass `-l` (load) to ninja as well
- s/BUILD_TYPE/CMAKE_GENERATOR/

Changes to the main Makefile:
- add `MAKEFILE_PATH` and `MAKEFILE_DIR` that are set with native commands
- add `NVIM_PRG`
- rename `BUILD_TYPE` to `CMAKE_GENERATOR` to align with CMake naming
- remove the misleading `BUILD_CMD` and use `BUILD_TOOL` instead

Add the following phony target to quickly test the changes

```make
debug-print:
	@echo makefile path: $(MAKEFILE_PATH)
	@echo makefile dir: $(MAKEFILE_DIR)
	@echo build dir: $(BUILD_DIR)
	@echo cmake generator tool: $(CMAKE_GENERATOR)
	@echo build-tool: $(BUILD_TOOL)
	@echo nvim-prg: $(NVIM_PRG)
```