initial work on string tries
created a StringTrie domain with default constructor and domain operation definitions
added StringTrie tests for setTop and setBottom operations
added string trie constructors inspired by StringPrefix class
initial work on string tries
created a StringTrie domain with default constructor and domain operation definitions
added StringTrie tests for setTop and setBottom operations
added string trie constructors inspired by StringPrefix class
small string trie test fix
Merge branch 'string_trie' of github.com:karelklic/canal into string_trie

Conflicts:
	tests/ArrayStringTrieTest.cpp
better memory management for string tries
string trie equality operator (work in progress)
string trie equality operator fix
replaced trie vector implementation with set
added trie node inequality operator
added memoryUsage function for string trie
added tests for SrtingTrie domain equality + initial toString implementation
Merge branch 'string_trie'