Import sr icons from svn

It makes no sense for them being in svn and then being added to the
tarball on release time

icons/CMakeLists.txt

 include(ECMInstallIcons)
 add_subdirectory(global)
+add_subdirectory(sr)
+add_subdirectory(sr@ijekavian)
+add_subdirectory(sr@ijekavianlatin)
+add_subdirectory(sr@latin)
 
 ecm_install_icons(ICONS
     16-actions-approved.png

icons/sr/CMakeLists.txt

+include(ECMInstallIcons)
+ecm_install_icons(ICONS
+    16-actions-approved.png
+    22-actions-approved.png
+    32-actions-approved.png
+    48-actions-approved.png
+    sc-actions-approved.svgz
+    DESTINATION ${DATA_INSTALL_DIR}/lokalize/icons
+    LANG sr
+    THEME hicolor
+)

icons/sr@ijekavian/CMakeLists.txt

+include(ECMInstallIcons)
+ecm_install_icons(ICONS
+    16-actions-approved.png
+    22-actions-approved.png
+    32-actions-approved.png
+    48-actions-approved.png
+    sc-actions-approved.svgz
+    DESTINATION ${DATA_INSTALL_DIR}/lokalize/icons
+    LANG sr@ijekavian
+    THEME hicolor
+)

icons/sr@ijekavianlatin/CMakeLists.txt

+include(ECMInstallIcons)
+ecm_install_icons(ICONS
+    16-actions-approved.png
+    22-actions-approved.png
+    32-actions-approved.png
+    48-actions-approved.png
+    sc-actions-approved.svgz
+    DESTINATION ${DATA_INSTALL_DIR}/lokalize/icons
+    LANG sr@ijekavianlatin
+    THEME hicolor
+)