FBIde 0.5.0.rc-1

Changes since 0.5.0.beta-3.

• Added new cobalt theme (Gothon).
• New styles for preprocessor identifier, number, operator and strings.
• Changed theme settings to use a tree layout for an easier overview.
• Fixed wstring and zstring classification, moved them to type keywords (#47).
• Fixed detection when a compound statement closer is not needed (#50).
• Fixed avoid de-indenting compound statement closers beyond opener level (#48).
• Fixed single-line asm statements no longer treated as multi-line block openers (#46).
• Fixed auto-indent and code formatter no longer add End Asm closer / indent body for single-line asm (#46).
• Fixed preprocessor lexing of "_" which would cause _ to be treated as a line continuation (#54).
• Changed IDE resource directory carrying a READONLY sentinel file is now mirrored to <user-data-dir>/ide on launch and loaded/saved from there (#39).
• Added Linux AppImage to the release pipeline; -DBUILD_APPIMAGE=ON switches the install layout to FHS and points the resource resolver at share/fbide/ide/ (#66).
• Changed log now writes to the per-user data directory by default and flushes after each record, so crash diagnostics survive; added --log-path to override the location.
• Changed <$terminal> placeholder is now read from compiler.terminal config (#45).
• Added run and compile command placeholder table.