Update release notes for release 4.3.1

Fix test for overload registration with add_class utility

Update version to 4.3.0

Update to 5.2.0

Merge branch 'master' into ChaiScript_5_0_CPP_11

Conflicts:
	CMakeLists.txt
	releasenotes.txt

Update version to 4.2.0

Merge branch 'master' into ChaiScript_5_0_CPP_11 / update version num…

…bers

Conflicts:
	CMakeLists.txt
	releasenotes.txt

Update for release 4.1.1

Update releasenotes and version numbers for 4.1.0 release

Prep for 5.0.0 release

Set CMakeLists.txt to version 4.0.0 for release