MQL5 support

[artbert]

The pull request includes proposal of my version of MQL5 support.
The idea was to:

• use new type of mql5 application type Service instead of EA
• prepare main interface to better reflect mql5 trading rules
• simplify a little bit message format communication

Please see [mql5/README.md] to read detailed information about my implementation.
I created new python files to not make mess in the project. Their names have '_MT5' suffix.
Final explanation of the ideas was placed as a commentary to the mql5 code.

[integracore2]

Hi @artbert ,

Thank you so much for your contribution! 😃

We'll review this as soon as we can - many thanks!

[jmarunix]

Hi,
I want to thanks all the people and your work, this project is amazing!!
And of course too, to @artbert, your proposal to MQL5 support works very fine with my config:
An old Pc with Debian + Wine + Metatrader5(32 Bits)

[Qoyyuum]

Proper README doc. Tested the code and it works as expected on a standard fresh Windows 10 machine with MT5 64bit installed.

[Zeta90]

Hi,
I want to thanks all the people and your work, this project is amazing!!
And of course too, to @artbert, your proposal to MQL5 support works very fine with my config:
An old Pc with Debian + Wine + Metatrader5(32 Bits)

GOD Bless u, mate

[brunobuger]

Amazing!
I'll test soon, we can dockerize if everything is working fine.
@artbert @jmarunix @Zeta90 any of you was able to run a simple performance comparison between Windows(native) and Linux(Wine/'emulated') ?

[Qoyyuum]

Amazing!
I'll test soon, we can dockerize if everything is working fine.

Run a separate pull request for a dockerize version of this connector and I'll help with the review.

[ivascen]

Any idea when this PR could be merged into master ?

[dominicfallows]

This would be great to merge into master, any update on when?