häte -> ggez

[ozkriff]

This PR:

• kills häte crate 😢
• renames rancor crate to zcomponents
• extracts ggwp-zgui and ggwp-zscene crates from häte's dead body
• updates some deps
• renames game_view mod to battle_view
• removes all android stuff (circleci config, readme info, do_android script, Cargo.toml metadata, etc)
• install SDL2 on CI
• removes deployment step from CI
• adds time_s helper func
• changes bg color
• ton of other small tweaks

The most serious downside of the engine switch, though temporary, is that there's no Android version of the game now.

Closes #237
Closes #245

[shmutalov]

No android builds... Sad 😢

[ozkriff]

No android builds... Sad 😢

@shmutalov I hope that this is temporary - #258 :)