FMSLogo Code

Fix build break when not using precompiled headers.

Fix a problem with the way the localizedstrings-XX.h files were build.
They had escaped non-ASCII characters with \x####, but if a hex character followed such a character, then it was interpreted as part of the code point, resulting in garbled text.
Now non-ASCII characteers are escaped with \u####, which is defined to have four hexadecimal digits. This is newer than \x, but has existed since C++ 11, so it shouldn't cause problems.

Generate ASCII C++ header files from the UTF-8 text translations.

Convert each of the localized header files into UTF-8.
This is the first step for integrating non-English languages into the Unicode build.

Document the breaking change to BACKSLASHEDP

Merge in changes from trunk (mostly to resolve conflicts)

Update the documentation for CHAR, ASCII, and RAWASCII for Unicode support.

Set up the release notes for v7.7.0, in case a bug fix is needed before v8.0.0 is ready.

Fix a misspelling of "Devuelve"

Mark that trunk has been merged into this branch.