Issue #122 (Implement "UnlockTicks" function in Mt5Api):

• Added event OnLockTicksEvent
• Implemented UnlockTicks function in MtApi

Issue #119 (Implement ResultRetcode function):

• Added out parameter MqlTradeResult to function PositionClose

Issue #120 (Json serialize problem):

• set field 'Symbol' as optional in MqlTradeRequest

Issue #121 (Original MtTime in MqlRates):

• Added original MtTime field to MqlRates

Issue #110 (MtApi5: implement functions for working with global variables):

• Implemented function for working with global variables

Issue #111 (MtApi5: enum SYMBOL_VISIBLE can be fixed now):

• Added enum value SYMBOL_VISIBLE

Issue #113 (Log4Net: change logfile extension to "log"):

• Changed extension of logging files to *.log

Issue #106 (QuoteUpdate enhancement):

• Extended structure Mt5Quote with fields from MqlTick (volume, last, time)