Editor: add commands for batch-replace of a source path for Sprites and AudioClips

[ivan-mogilko]

Problem

A situation: user moved their source assets into a different folder.
AGS does allow to modify the source path for both sprites and audio clips, but that only affects a single item. Fixing a large amount of items like that can be very tedious and time consuming.

Proposal

• Add a context menu command for replacing a parent portion of paths of "source file" for selected Sprites, and another for "all" Sprites in game.
• Add a context menu command for doing same for the AudioClips in certain folder, or "all" AudioClips.

This command lets to choose a folder, where it will automatically scan for matching filenames, including subdirectories, and assign new paths for all the items in selected range.