Orb-autokey title source

[myshevchuk]

Is your feature request related to a problem? Please describe.
See discussion #144

Describe the solution you'd like
Consider making orb-autokey-format %T[N][M][D] Zotero BBT-comliant. N stands for the number of words, M stands for the number of words to be capitalized, D stands for a delimiter. Consider retaining "the first L" characters - perhaps in the format %T[N][M][L][D], or more Zotero-like format %TN_M[L], so %T2_1[5] would mean "take the first two words, capitalize the first one, take at most 5 characters from each word."

It also seems orb-autokey has troubles with words containing special characters, such as - and '. In the first case, only the first part of the compound word is used, while in the second case the word is ignored completely.