Implement r0 crate in assembly

This implements the `r0::init_data` and `r0::zero_bss` routines in
assembly. There is a generic implementation for `riscv32` and
`riscv64`, since `riscv64` deals with alignment problems. The routines
are kept at their old calling site so that only one hardware thread
calls them. Consequently they are also inlined into the `start_rust`
function.

[Issue #122]

Added GH action to check clippy

Add feature single-hart

Signed-off-by: Chien Wong <m@xv97.com>

Use inline assembly instead of pre-compiled blobs

Fix oor branch via linking

Temporary fix for OOR branch

Move towards GHMQ

110: fix: avoid rust-analyzer snake case warning r=almindor a=sethp

It seems that rust-analyzer needs to operate over the expanded text of the proc macro (in order to e.g. support completion in the function body, see #11014 for way more details), so it "sees" the non-snake-case name emitted by riscv-rt's `entry` here.

Without this change, rust-analyzer will show a "weak warning" on invocations of `#[entry]` with the text:

```
Function `__risc_v_rt__main` should have snake_case name, e.g. `__risc_v_rt_main`
```

Co-authored-by: sethp <seth@codecopse.net>

It seems that rust-analyzer needs to operate over the expanded text of the proc macro (in order to e.g. support completion in the function body, see #11014 for way more details), so it "sees" the non-snake-case name emitted by riscv-rt's `entry` here.

Without this change, rust-analyzer will show a "weak warning" on invocations of `#[entry]` with the text:

```
Function `__risc_v_rt__main` should have snake_case name, e.g. `__risc_v_rt_main`
```

109: release v0.11.0 with riscv CS fix r=dkhayes117 a=almindor

Updates riscv to 0.10.1 with the critical section fix

Co-authored-by: Ales Katona <ales@katona.me>