resolc crate (#328)

- Factor the YUL crate out of `revive-solidity`.
- `revive-solidity` is in reality not a Solidity implementation but the
revive solidity compiler driver (`resolc`). By renaming we not only get
this straight but also a binary with the same name as the crate which
should be less confusing.

---------

Signed-off-by: Cyrill Leutwiler <bigcyrill@hotmail.com>

crates/resolc/src/version.rs

@@ -0,0 +1,30 @@
+//! The resolc compiler version.
+
+use serde::Deserialize;
+use serde::Serialize;
+
+/// The resolc compiler version.
+#[derive(Debug, Serialize, Deserialize, Clone)]
+pub struct Version {
+    /// The long version string.
+    pub long: String,
+    /// The short `semver`.
+    pub default: semver::Version,
+    /// The LLVM version string.
+    pub llvm: semver::Version,
+}
+
+impl Default for Version {
+    fn default() -> Self {
+        let default = semver::Version::parse(env!("CARGO_PKG_VERSION")).expect("Always valid");
+        let commit = env!("GIT_COMMIT_HASH");
+        let (llvm_major, llvm_minor, llvm_patch) = inkwell::support::get_llvm_version();
+        let llvm = semver::Version::new(llvm_major as u64, llvm_minor as u64, llvm_patch as u64);
+
+        Self {
+            long: format!("{default}+commit.{commit}.llvm-{llvm}"),
+            default,
+            llvm,
+        }
+    }
+}