per project history cache control

[vladak]

On top of #4063, it does not seem to be possible to control history cache on per-project/repository level. This would hit similar obstacles such as

opengrok/opengrok-indexer/src/main/java/org/opengrok/indexer/history/HistoryGuru.java

Lines 117 to 121 in 05f9a7f

	if (env.useHistoryCache()) {
	cache = new FileHistoryCache();
	try {
	cache.initialize();