build: More repo cleanup, move libimhex and external libs to /lib folder

lib/libimhex/include/hex/api/imhex_api.hpp

@@ -0,0 +1,67 @@
+#pragma once
+
+#include <hex.hpp>
+
+#include <list>
+#include <vector>
+#include <string>
+
+#include <hex/helpers/concepts.hpp>
+#include <hex/api/task.hpp>
+#include <hex/api/keybinding.hpp>
+
+namespace hex {
+
+    namespace prv { class Provider; }
+
+    namespace ImHexApi {
+        namespace Common {
+
+            void closeImHex(bool noQuestions = false);
+            void restartImHex();
+
+        };
+
+        namespace Bookmarks {
+            struct Entry {
+                Region region;
+
+                std::vector<char> name;
+                std::vector<char> comment;
+                u32 color;
+                bool locked;
+            };
+
+            void add(Region region, const std::string &name, const std::string &comment, u32 color = 0x00000000);
+            void add(u64 addr, size_t size, const std::string &name, const std::string &comment, u32 color = 0x00000000);
+
+            std::list<Entry>& getEntries();
+        };
+
+        namespace Provider {
+
+            prv::Provider* get();
+            const std::vector<prv::Provider*>& getProviders();
+
+            bool isValid();
+
+            void add(prv::Provider *provider);
+
+            template<hex::derived_from<prv::Provider> T>
+            void add(auto&& ... args) {
+                add(new T(std::forward<decltype(args)>(args)...));
+            }
+
+            void remove(prv::Provider *provider);
+
+        };
+
+        namespace Tasks {
+
+            Task createTask(const std::string &unlocalizedName, u64 maxValue);
+
+        }
+
+    };
+
+}