new doc SAVE_FORMAT, new unihan font WenQuanYi

Former-commit-id: 654fe713ae8165ed37fc85535e9536b01a5fe611
Former-commit-id: 34468f4d34b3dfd4be01c48c7fab34fe04678a6b

out/production/Terrarum_renewed/com/Torvald/Terrarum/MECHNANICS

@@ -104,8 +104,9 @@
 
 ==  (De)serialisation  ==
 
-   * Custom binary + GSON
+    see SAVE_FORMAT
 
-   * Custom binary: Game map
 
-   * GSON: Actors, game configurations
+==  Actor being universal  ==
+
+    * Utility tiles that have states (e.g. noteblock) are implemented using Actor.

out/production/Terrarum_renewed/com/Torvald/Terrarum/SAVE_FORMAT

@@ -0,0 +1,55 @@
+*  Save meta
+    - Binary (for more security)
+    - Filename : world (with no extension)
+
+    Type        Mnemonic    Description
+
+    Byte[4]     TESV        Magic
+    Byte[n]     name        Savegame name, UTF-8
+    Byte        null        String terminator
+    Byte[8]     terraseed   Terrain seed
+    Byte[8]     <arb name>  possible other seeds
+    Byte[32]    hash1       SHA-256 hash of worldinfo1 being stored
+    Byte[32]    hash2       SHA-256 hash of worldinfo2 being stored
+    Byte[32]    hash3       SHA-256 hash of worldinfo3 being stored
+    Byte[32]    hash4       SHA-256 hash of worldinfo4 beihg stored (TEMD data) [32, 214, 42, 3, 76, ...]
+
+
+*  Actor data
+    - GZip'd GSON
+    - Filename : <refid> (with no extension)
+
+
+*  Prop data
+    - GZip'd CSV
+    - Filename : worldinfo1 -- tileprop.csv
+                 worldinfo2 -- itemprop.csv (with no extension)
+
+
+*  Roguelike randomiser data
+    - GZip'd GSON
+    - Filename : worldinfo3
+
+
+*  Human-readable
+    - Tiles_list.txt -- list of tiles in csv
+    - Items_list.txt -- list of items in csv
+
+
+
+==  How it works  ==
+    * If hash discrepancy is detected, (hash of csv in save dir != stored hash || hash of TEMD != stored hash)
+      printout "Save file corrupted. Continue?" with prompt "Yes/No"
+
+    Directory:
+
+    +--- <save1>
+     --- 2a93bc5fd...f823   Actor data
+     --- 423bdc838...93bd   Actor data
+     --- Items_list.txt     Human-readable
+     --- Tiles_list.txt     Human-readable
+     --- world              save meta
+     --- worldinfo1         tileprop
+     --- worldinfo2         itemprop
+     --- worldinfo3         Roguelike randomiser
+     --- worldinfo4         TEMD binary