Document dictionary usage in headers

Add standardized headers listing the official config usage for each top-level dictionary file.

Author: frankslin

data/dictionary/HKVariants.txt

@@ -1,3 +1,10 @@
+# Open Chinese Convert (OpenCC) Dictionary
+# File: HKVariants.txt
+# Format: key	value(s) (values separated by spaces)
+# License: Apache-2.0 (see LICENSE)
+# Source: https://github.com/ByVoid/OpenCC
+# Used in configs: s2hk.json, t2hk.json
+
 僞	偽
 兌	兑
 叄	叁

data/dictionary/HKVariantsRevPhrases.txt

@@ -1,3 +1,10 @@
+# Open Chinese Convert (OpenCC) Dictionary
+# File: HKVariantsRevPhrases.txt
+# Format: key	value(s) (values separated by spaces)
+# License: Apache-2.0 (see LICENSE)
+# Source: https://github.com/ByVoid/OpenCC
+# Used in configs: hk2s.json, hk2t.json
+
 一口吃個	一口喫個
 一口吃成	一口喫成
 一家三口	一家三口

data/dictionary/JPShinjitaiCharacters.txt

@@ -1,3 +1,10 @@
+# Open Chinese Convert (OpenCC) Dictionary
+# File: JPShinjitaiCharacters.txt
+# Format: key	value(s) (values separated by spaces)
+# License: Apache-2.0 (see LICENSE)
+# Source: https://github.com/ByVoid/OpenCC
+# Used in configs: jp2t.json
+
 両	兩 輛
 弁	辨 辯 瓣 辦 弁
 御	御 禦

data/dictionary/JPShinjitaiPhrases.txt

@@ -1,3 +1,10 @@
+# Open Chinese Convert (OpenCC) Dictionary
+# File: JPShinjitaiPhrases.txt
+# Format: key	value(s) (values separated by spaces)
+# License: Apache-2.0 (see LICENSE)
+# Source: https://github.com/ByVoid/OpenCC
+# Used in configs: jp2t.json
+
 一獲千金	一攫千金
 丁寧	叮嚀
 丁重	鄭重

data/dictionary/JPVariants.txt

@@ -1,3 +1,10 @@
+# Open Chinese Convert (OpenCC) Dictionary
+# File: JPVariants.txt
+# Format: key	value(s) (values separated by spaces)
+# License: Apache-2.0 (see LICENSE)
+# Source: https://github.com/ByVoid/OpenCC
+# Used in configs: t2jp.json
+
 乘	乗
 亂	乱
 亙	亘

data/dictionary/STCharacters.txt

@@ -1,3 +1,10 @@
+# Open Chinese Convert (OpenCC) Dictionary
+# File: STCharacters.txt
+# Format: key	value(s) (values separated by spaces)
+# License: Apache-2.0 (see LICENSE)
+# Source: https://github.com/ByVoid/OpenCC
+# Used in configs: s2hk.json, s2t.json, s2tw.json, s2twp.json
+
 㐷	傌
 㐹	㑶 㐹
 㐽	偑

data/dictionary/STPhrases.txt

@@ -1,3 +1,10 @@
+# Open Chinese Convert (OpenCC) Dictionary
+# File: STPhrases.txt
+# Format: key	value(s) (values separated by spaces)
+# License: Apache-2.0 (see LICENSE)
+# Source: https://github.com/ByVoid/OpenCC
+# Used in configs: s2hk.json, s2t.json, s2tw.json, s2twp.json
+
 㓦划	㓦劃
 一丝不挂	一絲不掛
 一了心愿	一了心願

data/dictionary/TSCharacters.txt

@@ -1,3 +1,10 @@
+# Open Chinese Convert (OpenCC) Dictionary
+# File: TSCharacters.txt
+# Format: key	value(s) (values separated by spaces)
+# License: Apache-2.0 (see LICENSE)
+# Source: https://github.com/ByVoid/OpenCC
+# Used in configs: hk2s.json, t2s.json, tw2s.json, tw2sp.json
+
 㑮	𫝈
 㑯	㑔
 㑳	㑇

data/dictionary/TSPhrases.txt

@@ -1,3 +1,10 @@
+# Open Chinese Convert (OpenCC) Dictionary
+# File: TSPhrases.txt
+# Format: key	value(s) (values separated by spaces)
+# License: Apache-2.0 (see LICENSE)
+# Source: https://github.com/ByVoid/OpenCC
+# Used in configs: hk2s.json, t2s.json, tw2s.json, tw2sp.json
+
 一目瞭然	一目了然
 上鍊	上链
 不瞭解	不了解

data/dictionary/TWPhrases.txt

@@ -1,3 +1,10 @@
+# Open Chinese Convert (OpenCC) Dictionary
+# File: TWPhrases.txt
+# Format: key	value(s) (values separated by spaces)
+# License: Apache-2.0 (see LICENSE)
+# Source: https://github.com/ByVoid/OpenCC
+# Used in configs: s2twp.json (via TWPhrases.ocd2)
+
 PN結	PN接面
 SQL注入	SQL隱碼攻擊
 SQL注入攻擊	SQL隱碼攻擊