Fix: Restore changes from 2.0.4 to 2.0.5 fixing bug when updating theme on init

This PR restores these PR with changes to not initialize on package initialization but instead during the Loaded event of the ConanToolWindowControl.

Fix: Add absolute path for images in README by @danimtb in https://github.com/conan-io/conan-vs-extension/pull/228
Fix: Adapt plugin colors to selected theme by @czoido in https://github.com/conan-io/conan-vs-extension/pull/237
Fix: Set correct compiler.runtime based on GUI preferences by @memsharded in https://github.com/conan-io/conan-vs-extension/pull/235

conan-io / conan-vs-extension