Added Plugin support (#102)

* Build refactoring and initial plugin support

* Possibly fixed linux / mac build

* Added libdl to libglad build script

* Add glfw to imgui dependencies

* Refactored common functionality into "libimhex" for plugins

* Added plugin loading and example plugin

* Added proper API for creating a custom view and a custom tools entry with plugins

source/views/view_disassembler.cpp

@@ -29,7 +29,7 @@ namespace hex {
         View::unsubscribeEvent(Events::RegionSelected);
     }
 
-    void ViewDisassembler::createView() {
+    void ViewDisassembler::drawContent() {
         if (this->m_shouldInvalidate) {
             this->m_disassembly.clear();
 
@@ -282,7 +282,7 @@ namespace hex {
         ImGui::End();
     }
 
-    void ViewDisassembler::createMenu() {
+    void ViewDisassembler::drawMenu() {
 
     }