Update dtk-template & add CI

[encounter]

This brings the repo up to date with dtk-template, and adds a CI workflow.

Notably:

• The orig/RSBE01 dir has been renamed to RSBE01_02. Devs will have to move their files to the new location. Directory structure is created for all other Brawl versions, even though no configuration exists for them yet.
• HomeBtnIcon was converted to use dtk's extract feature (see config/RSBE01_02/config.yml)
• VS Code configuration was added to use clangd, which is more accurate than IntelliSense, but it will complain about invalid syntax in source files that use MWCC-specific features. These can be fixed incrementally by wrapping them in macros. For example, __declspec(section ".init") could be replaced with something like:

  #ifdef __MWERKS__
  #define DECL_SECTION(name) __declspec(section name)
  #else
  #define DECL_SECTION(name)
  #endif
• Enhanced CLI progress reporting via objdiff-cli. This now shows "Matched %" as the primary metric, which includes matching functions in unlinked/NonMatching files, instead of only counting linked files.
• Updated README.md to have complete setup instructions.

[mparisi20]

lgtm