Use the native TMX tile animation format

Rewrote the tile animation loading code based on XML tags, replacing
the code that loaded tile animations from tile properties.

Also made a number of code simplifications and optimizations:

* Replaced a number of pointer members with value members.
* Pass around Animation and TileAnimation by value, using std::move to
  avoid allocating copies.
* push -> emplace
* push_front -> emplace_front
* push_back -> emplace_back
* Use range-based for loops
* Use std::vector instead of std::list for storing affected tiles
  (less fragmentation)
* Avoid string copies and allocations while parsing CSV layer data.
* Replaced xmlNodeGetContent with directly accessing 'content'.

1 files changed, 6 insertions, 2 deletions

diff --git a/src/resources/animation.cpp b/src/resources/animation.cpp
index 1be27c2c..b48e8cff 100644
--- a/src/resources/animation.cpp
+++ b/src/resources/animation.cpp
@@ -23,8 +23,12 @@
 
 void Animation::addFrame(Image *image, int delay, int offsetX, int offsetY)
 {
-    Frame frame = { image, delay, offsetX, offsetY };
-    mFrames.push_back(frame);
+    auto &frame = mFrames.emplace_back();
+    frame.image = image;
+    frame.delay = delay;
+    frame.offsetX = offsetX;
+    frame.offsetY = offsetY;
+
     mDuration += delay;
 }