Merge pull request #2704 from HaxeFoundation/development

3.1.0
set changes.txt date
Merge pull request #2707 from HaxeFoundation/development

3.1.0 hotfix
Update README.md
Merge pull request #2761 from HaxeFoundation/development

3.1.1
update release-checklist.txt
Use proper path separators for Display file
(Flash9) use real field name to check for overrides (closes #2785)
Merge pull request #2800 from jlegrande/development

Use proper path separators for Display file
Add class_path as include path to hxcpp
added Sys.time() test

Lazy test in relation to :
https://github.com/HaxeFoundation/hxcpp/issues/30
Merge pull request #2819 from Dvergar/development

added Sys.time() test
let's test sys things only on sys targets
move Codegen.concat to Type.concat
force constructors if the class has member initialization values (closes #2722)
constructors are methods
remove 2>/dev/null from makefile kill (does not work for me)
CHANGES.txt update
optimized "remove" by using __in__ instead of hasOwnProperty
added (do not use $ prefix for keys which cause allocation)