add basic_widgets dependency

meson.build

@@ -1,6 +1,6 @@
 project('chainreact', 'cpp',
-  version : '0.1',
-  default_options : ['warning_level=3', 'cpp_std=c++14'])
+  version : '0.1pre',
+  default_options : ['warning_level=3', 'cpp_std=c++20'])
 
 executable('chainreact',
            'board.cpp',
@@ -9,5 +9,8 @@ executable('chainreact',
            'sdl_graphics.cpp',
            'sdl_ui.cpp',
            dependencies : [
-              dependency('sdl2')],
+              dependency('basic_widgets',
+                  static : true,
+                  )
+              ],
            install : true)

subprojects/basic_widgets.wrap

@@ -0,0 +1,6 @@
+[wrap-git]
+url = https://git.nekomata.one/git/sdl2_basic_widgets.git
+revision = head
+
+[provide]
+basic_widgets = libbasic_widgets_dep