lsp: improve LSP IR2 hovers (#1891)

Some new hover features:

docstrings (`@param/@return` syntax is not yet supported, nor is a
syntax-highlighted preview, will do later)

![image](https://user-images.githubusercontent.com/13153231/190830490-d0ef774c-e7e5-4bb9-8007-b366be0f491e.png)

better MIPs instruction descriptions

![image](https://user-images.githubusercontent.com/13153231/190830507-0bb35c13-7e88-4b74-a63b-b7fb3587b82e.png)

numeric hovers convert to different bases / tell you the OpenGOAL method
id (i can't tell you the amount of times ive done -16 / 4 manually
myself...)

![image](https://user-images.githubusercontent.com/13153231/190830674-f66ed15a-f983-48ff-b251-259374dfbcac.png)

Closes https://github.com/open-goal/opengoal-vscode/issues/33
Closes https://github.com/open-goal/opengoal-vscode/issues/31
Related to https://github.com/open-goal/opengoal-vscode/issues/29

lsp/main.cpp

@@ -92,7 +92,7 @@ int main(int argc, char** argv) {
         for (const auto& response : responses.value()) {
           std::cout << response.c_str() << std::flush;
           if (appstate.verbose) {
-            lg::trace("<<< Sending message: {}", response);
+            lg::debug("<<< Sending message: {}", response);
           } else {
             lg::info("<<< Sending message of method '{}'", method_name);
           }