* Finishing the `webui_set_file_handler()` feature. Thanks to @petabyt
* Removing `free()` and replace it by the WebUI version
* Minor core changes to make `webui_set_file_handler()` working
* Update serve a folder example to show how to use `webui_set_file_handler()`
## New Public API:
* `void webui_set_file_handler(size_t window, const void* (*handler)(const char* filename, int* length))`
* `void* webui_malloc(size_t size)`
* Set C++11 as minimal standard
* Fix C++ Makefile in macOS
* Update the C++ WebUI header to use references (https://github.com/webui-dev/webui/issues/103)
* Update `webui_return_string()` argument from `char*` to `const char*`
# Changes
* `webui_run` changed from `bool` to `void` as it run the script fast with no return
# New
* `char* webui_encode(const char* str)` encode string to base64
* `char* webui_decode(const char* str)` decode base64 to string
* `void webui_free(void* ptr)` free resource allocated by WebUI (_when using webui_encode()_)
* A text editor example
# Fix
* Now WebUI wait in loop while the application requestion more html files (_Large HTML UI_)
# New:
* New API: `void webui_new_window_id(size_t window_number)`
* New API: `void webui_destroy(size_t window)`
_Please see C serve_a_folder example on how to use webui_new_window_id()_
# Changes
* To keep consistency with window IDs, all `unsigned int` changed to `size_t`
# Users/Wrappers Changes
* The window object changed from `void*` (pointer) to a simple `size_t` (integer)
# New Core Features And Changes
* License changed from `GPLv2` to 'MIT'. Thanks to @xD0135
* The core APIs is completely changed from `Mongoose` to `civetweb`. Thanks to @xD0135
* Kiosk mode support. Thanks to @malisipi
* UI responses resolving using IDs instead of first received (WebUI-JS-Bridge)
* Fix C++ Linux Clang build issue (C++ Linux GCC still broken)
* In webui_event_t `type` changed to `event_type`. This is because some wrapper's language does not support using _type_ as a variable name.
* In webui_event_t `char* response` changed to `unsigned int event_number`.
* Now `webui_interface_set_response()` use a simple `unsigned int event_number` instead of `char* response`.
