Add tab format.

formats/tab.ksy

@@ -0,0 +1,51 @@
+meta:
+  id: aim_db_tab
+  endian: le
+  
+seq:
+  - id: header
+    type: tab
+  - id: tables
+    type: table
+    repeat: expr
+    repeat-expr: header.n_tables
+  - id: fields
+    type: field
+    repeat: expr
+    repeat-expr: header.n_fields
+
+types:
+  char20:
+    seq:
+        - id: str
+          type: str
+          encoding: ASCII
+          size: 0x20
+
+  tab:
+    seq:
+        - id: n_tables
+          type: u4
+        - id: n_fields
+          type: u4
+          
+  table:
+    seq:
+        - id: id
+          type: u4
+        - id: name
+          type: char20
+        - id: unk
+          type: u4
+          
+  field:
+    seq:
+        - id: table_id
+          type: u4
+        - id: id
+          type: u4
+        - id: name
+          type: char20
+        - id: field_type
+          type: u4
+