Add a dependency for function2

std::function requires the function to be CopyConstructable and thus
does not allow you to capture by move, which is exactly what we need.

README.md

@@ -499,6 +499,7 @@ the following dependencies:
 The following dependencies are included in the repository as a Meson wrap:
 
 - bitsery
+- function2
 - tomlplusplus
 
 The project can then be compiled as follows:

meson.build

@@ -73,6 +73,7 @@ boost_filesystem_dep = dependency(
   static : with_static_boost
 )
 bitsery_dep = subproject('bitsery').get_variable('bitsery_dep')
+function2_dep = subproject('function2').get_variable('function2_dep')
 threads_dep = dependency('threads')
 tomlplusplus_dep = subproject('tomlplusplus', version : '2.1.0').get_variable('tomlplusplus_dep')
 # The built in threads dependency does not know how to handle winegcc
@@ -141,6 +142,7 @@ executable(
     boost_dep,
     boost_filesystem_dep,
     bitsery_dep,
+    function2_dep,
     tomlplusplus_dep,
     wine_threads_dep,
     xcb_dep
@@ -158,6 +160,7 @@ executable(
     boost_dep,
     boost_filesystem_dep,
     bitsery_dep,
+    function2_dep,
     tomlplusplus_dep,
     wine_threads_dep,
     xcb_dep
@@ -203,6 +206,7 @@ if with_bitbridge
       boost_dep,
       boost_filesystem_dep,
       bitsery_dep,
+      function2_dep,
       tomlplusplus_dep,
       wine_threads_dep,
       xcb_dep
@@ -227,6 +231,7 @@ if with_bitbridge
       boost_dep,
       boost_filesystem_dep,
       bitsery_dep,
+      function2_dep,
       tomlplusplus_dep,
       wine_threads_dep,
       xcb_dep

subprojects/function2.wrap

@@ -0,0 +1,10 @@
+[wrap-file]
+directory = function2-4.1.0
+
+source_url = https://github.com/Naios/function2/archive/4.1.0.tar.gz
+source_filename = function2-4.1.0.tar.gz
+source_hash = c3aaeaf93bf90c0f4505a18f1094b51fe28881ce202c3bf78ec4efb336c51981
+
+patch_url = file:./subprojects/function2-patch-4.1.0.tar.xz
+patch_filename = function2-patch-4.1.0.tar.xz
+patch_hash = 4b966afd862413ea1f3d96484e74401992ec958f1ee2b4cc161f3cb7c36fe7ba