language selection popup

WIP: because it's not over yet.

WIP because needs !223 (merged)

Strongly recommends !186 (merged) or it will be hard to see and test changes.

Needs https://source.puri.sm/Purism/Systems-Tasks/issues/451 for pipelines.

Left to do:

• specify Debian deps
• position the popover
• clean up commits
• translate and sort language names

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• 00860950 - WIP: old Rust woes

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Conflicts with !207 (merged) (event submission improved).

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added 78 commits

• 68bc90b4...29231f7e - 73 commits from branch Librem5:master
• 3b6c1940 - util: Added pointer comparison struct
• c99efc43 - presses: Move press handling to Rust
• 1290fd4a - rust: Fix old compiler compat
• 38d13bb2 - Add a popover menu to switch languages
• 1c78e063 - tests: Make sure transformation works sensibly

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• a00bdd95 - Add a popover menu to switch languages

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@tobias.bernard ready for testing!

I see some warnings when building:

[60/61] Linking target src/squeekboard.
/usr/bin/ld: src/librs.a(gtk-41e6c064fc9ae6df.gtk.33sp6d5s-cgu.11.rcgu.o)(.debug_info+0x73741): R_AARCH64_ABS64 used with TLS symbol _ZN3gtk2rt14IS_MAIN_THREAD7__getit5__KEY17hc27f02cc2352eb76E
/usr/bin/ld: src/librs.a(gdk-d16e17236bc8973c.gdk.27bwtgo9-cgu.6.rcgu.o)(.debug_info+0x64): R_AARCH64_ABS64 used with TLS symbol _ZN3gdk2rt14IS_MAIN_THREAD7__getit5__KEY17hffc79560aa2f2890E
/usr/bin/ld: src/librs.a(fragile-deda1a9388ac2bbb.fragile.8vwzb4fe-cgu.15.rcgu.o)(.debug_info+0x6c): R_AARCH64_ABS64 used with TLS symbol _ZN7fragile6sticky8REGISTRY7__getit5__KEY17hbf2198fc87d19f4bE
/usr/bin/ld: src/librs.a(glib-d945f68226b7665a.glib.6ybr41be-cgu.15.rcgu.o)(.debug_info+0xfc2e): R_AARCH64_ABS64 used with TLS symbol _ZN4glib13get_thread_id9THREAD_ID7__getit5__KEY17h5f41bf14a79b9d75E
/usr/bin/ld: src/librs.a(fragile-deda1a9388ac2bbb.fragile.8vwzb4fe-cgu.11.rcgu.o)(.debug_info+0x71): R_AARCH64_ABS64 used with TLS symbol _ZN7fragile7fragile13get_thread_id9THREAD_ID7__getit5__KEY17h79aac044b7b77d8aE

Uh oh. Does it cause any crashes?

Maybe solved by LLVM: http://llvm.org/viewvc/llvm-project?revision=338655&view=revision

Since we're probably not going to pull LLVM just for this, and because the variables in the warning don't seem to be very important, then as long as there are no crashes in any part of the popup, we can carefully have it.

It seems to work OK. I tried adding languages in the control center and they appeared in the popup.

We may need to change the language code for Norwegian, however, because it doesn't get picked up properly.