replaced imgui with cimgui shared lib to use with c# bindings

dependencies/cimgui.config

@@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+DEP_WORKING_DIR='dependencies/cimgui'
+DEP_PRE_BUILD_COMMAND=''
+if [[ "$TASK" = *_dbg ]]; then
+    DEP_BUILD_COMMAND='cbuild -c ../cimgui.project.config build_shared_lib_dbg'
+else
+    DEP_BUILD_COMMAND='cbuild -c ../cimgui.project.config build_shared_lib'
+fi
+DEP_POST_BUILD_COMMAND='rm -f cbuild.log'
+DEP_CLEAN_COMMAND='cbuild clean -c ../cimgui.project.config'
+DEP_STATIC_OUT_FILES=''
+case $OS in
+    WINDOWS)
+        DEP_DYNAMIC_OUT_FILES="../bin/cimgui.dll"
+        ;;
+    LINUX)
+        DEP_DYNAMIC_OUT_FILES="../bin/cimgui.so"
+        ;;
+    *)
+        error "operating system $OS has no configuration variants"
+        ;;
+esac