added missing floor() function
added missing ceil() function
added doc files for floor and ceil
alias ceiling() for ceil()
[[ Bug 13354 ]] Replace deprecated MPMoviePlayerContentPreloadDidFinishNotification
Merge remote-tracking branch 'ali/bugfix-13354' into bugfix-13354
Merge branch 'bugfix-13354' into release-6.6.3-b
Update version for 6.6.3.
[[ Bug 13374 ]] LC hangs when setting the text of the field having a HGRID and a hidden last line.
Merge pull request #1148 from runrevsebastien/bugfix-13374

[[ Bug 13374 ]] LC hangs when setting the text of the field having a HGR...
Merge branch 'release-6.6.3-b'
Revert "Merge pull request #1148 from runrevsebastien/bugfix-13374"

This reverts commit 00b564c79e03e626b4d1380c7596ba2f441c17a3, reversing
changes made to 264107fb9b02fd0ef80948bfe0fd1b7edeffb79d.
Update prebuilt submodule pointer.
Merge branch 'master' of https://github.com/runrev/livecode

Conflicts:
	prebuilt
	version