Some major updates including heuristics

- Allow to define heuristics in heuristics.yaml
- Migrate all filetypes from vim beginning with "a"
- Remove enhanced cpp syntax (it was too slow to load)
- Use setf instead of set ft for setting filetype (faster)
- Override native hauristics with au!
- Add globbing of files for packages
- Replace predefined dirs with extra_dirs and ignored_dirs
- Allow to define proper order of packages with topological sort
- Fix powershell detection
- Lint and fix many packages.yaml issues
- etc etd

Makefile

@@ -1,7 +1,10 @@
-.PHONY: all
+.PHONY: all test dev
 
 all:
 	@ scripts/build
 
 test:
 	@ scripts/test
+
+dev:
+	@ echo "packages.yaml\nheuristics.yaml\nscripts/test\nscripts/build\nscripts/test_extensions.vim" | DEV=1 entr bash -c 'make && make test'