thcrap: Support right-to-left scripts

Right-to-left text

Description

It was only a matter of time until people asked for this.

Prerequisites

• #17 (text layout engine)
• #16 (Win32 dialog patching)

Implementation

• If possible, this should not require a special "rtl": true flag in the run configuration. Directionality should be automatically determined by the characters in a string. Otherwise, patch stacks that have a RTL language on top of an LTR one couldn't easily switch between both.
• Neither should it require all texts to simply be wrapped in a <r$text$> command. Once tabs come into play, we need to mirror those too.
• Add a breakpoint to read the current width of the rendering bitmap.
• According to this page, Win32 dialogs can be easily mirrored. Find the best way to do this.
• ... and then there's texture positioning. We probably could start by searching for a general "set X position" point and mirroring that value. Anything more will be part of a separate issue, though.

Start by reading prerequisites #17 on the text layout engine and #16 on Win32 dialog patching. Investigate automatic direction detection, bitmap width, dialog mirroring, tab placement, and texture positioning; done means RTL and LTR text can switch without a run flag or wrapping every string in a special command.