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, 1 insertions, 1 deletions

diff --git a/src/resources/animation.h b/src/resources/animation.h
index 59601dc4..7fc14857 100644
--- a/src/resources/animation.h
+++ b/src/resources/animation.h
@@ -43,7 +43,7 @@ struct Frame
  * An animation consists of several frames, each with their own delay and
  * offset.
  */
-class Animation
+class Animation final
 {
     public:
         Animation() = default;