Consolidate the general, platform-agnostic part of the main()/WinMain()
in static FCHost::main() function to avoid code duplication.

Linux handlers and main() were copied from the cefsimple test app,
persistent storage implementation rewritten using cstdio and
std::filesystem to make it cross-platform.

Only run pipelines in the main repo

See merge request pregmodfan/fc-pregmod!9118

Heterochromia

Closes #2942

See merge request pregmodfan/fc-pregmod!9117

/js is not a dumping ground for everything js

See merge request pregmodfan/fc-pregmod!9116

changeLanguageJS

See merge request pregmodfan/fc-pregmod!9078

Sanity check fixes

See merge request !9115

Minor QoL changes

See merge request !9114

cleanup reCockmilkInterception.js

See merge request !9112

Update SC to v2.35.0

See merge request !9110

Mostly doc changes and some bug fixes

Always compile the HEAD of the default branch (pregmod-master)

See merge request pregmodfan/fc-pregmod!9109

Fix minification if tweego exists in $PATH

See merge request pregmodfan/fc-pregmod!9108

cockmilk interception to js

See merge request pregmodfan/fc-pregmod!9070

Fix .boobsMilk issues

See merge request !9107

Eslint cleaning

See merge request !9105

Replace all twine legacy scripts with Gulp task

See merge request !9103

Minify svg files

See merge request !9104