Separate compilation and linker phases (#376)

Separate between compilation and linker phases to allow deploy time
linking and back-porting era compiler changes to fix #91. Unlinked
contract binaries (caused by missing libraries or missing factory
dependencies in turn) are emitted as raw ELF object.

Few drive by fixes:
- #98
- A compiler panic on missing libraries definitions.
- Fixes some incosistent type forwarding in JSON output (empty string
vs. null object).
- Remove the unused fallback for size optimization setting.
- Remove the broken `--lvm-ir`  mode.
- CI workflow fixes.

---------

Signed-off-by: Cyrill Leutwiler <bigcyrill@hotmail.com>
Signed-off-by: xermicus <bigcyrill@hotmail.com>
Signed-off-by: xermicus <cyrill@parity.io>

.github/workflows/release.yml

@@ -132,7 +132,7 @@ jobs:
         run: |
           result=$(./resolc-${{ matrix.target }} --bin crates/integration/contracts/flipper.sol)
           echo $result
-          if [[ $result == *'0x50564d'* ]]; then exit 0; else exit 1; fi
+          if [[ $result == *'50564d'* ]]; then exit 0; else exit 1; fi
 
       - uses: actions/upload-artifact@v4
         with:

.github/workflows/test.yml

@@ -26,6 +26,7 @@ jobs:
         with:
           # without this it will override our rust flags
           rustflags: ""
+          components: rustfmt, clippy
 
       - name: Install Solc
         uses: ./.github/actions/get-solc