Update SDL2pp to 0.7.0

AMDmi3 · AMDmi3 · commit 1bee9008cf28 · 2015-01-22T20:52:06.000+03:00
diff --git a/extlibs/SDL2pp b/extlibs/SDL2pp
@@ -1 +1 @@
-Subproject commit 2e3f6bbeb2e51f2c8e7dad0be4496568d4db9851
+Subproject commit e5210da8915fd9394a48fb89ee7dce373aac15a4
