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

plugins/libimhex/include/providers/provider.hpp

@@ -0,0 +1,49 @@
+#pragma once
+
+#include <hex.hpp>
+
+#include <map>
+#include <optional>
+#include <string>
+#include <vector>
+
+namespace hex::prv {
+
+    class Provider {
+    public:
+        constexpr static size_t PageSize = 0x1000'0000;
+
+        Provider();
+        virtual ~Provider() = default;
+
+        virtual bool isAvailable() = 0;
+        virtual bool isReadable() = 0;
+        virtual bool isWritable() = 0;
+
+        virtual void read(u64 offset, void *buffer, size_t size);
+        virtual void write(u64 offset, const void *buffer, size_t size);
+
+        virtual void readRaw(u64 offset, void *buffer, size_t size) = 0;
+        virtual void writeRaw(u64 offset, const void *buffer, size_t size) = 0;
+        virtual size_t getActualSize() = 0;
+
+        std::map<u64, u8>& getPatches();
+        void applyPatches();
+
+        u32 getPageCount();
+        u32 getCurrentPage() const;
+        void setCurrentPage(u32 page);
+
+        virtual size_t getBaseAddress();
+        virtual size_t getSize();
+        virtual std::optional<u32> getPageOfAddress(u64 address);
+
+        virtual std::vector<std::pair<std::string, std::string>> getDataInformation() = 0;
+
+    protected:
+        u32 m_currPage = 0;
+
+        std::vector<std::map<u64, u8>> m_patches;
+    };
+
+}