Updated CHANGELOG and README for LuaRT Studio 1.8.0

Updated to latest LuaRT toolchain

Updated to latest LuaRT toolchain

Updated: Examples and toolchain updated to LuaRT 1.8.0

- New: Theme selection is now available in the new `Edit\Preferences\Theme` menu

Updated to LuaRT 1.7.1 toolchain

Updated examples to LuaRT 1.7.1

Fixed: Running scripts with arguments sets now the `arg` table correctly

Updated CHANGELOG

Updated to LuaRT 1.7.0 toolchain

New: New command/toolbar icon to open RTBuilder for the current open file, if it's a Window generated by RTBuilder

Updated: LuaRT Studio updated to LuaRT 1.7.0 toolchain and modules

New: New canvas examples `balls_demo.lua`

Updated to LuaRT Studio 1.7.0

Fixed: Output pane now uses UNICODE or no encoding at all automaticaly (using standard Lua io functions wont show wrong characters anymore) (Fixes #21)