[dashpay/dash] Dash-qt has a memory leak ! (#2223)

To report critical security issues, email infosec@dash.org instead of creating Github issues.

### Describe the issue
Leaving my Dash Qt (wallet) opened up for 2 days, it’s memory commitment went up to 10 Gigs ! Dash Core 12.3.2 (latest) on Windows 7 x64.

Debug log attached:
https://www.dropbox.com/s/35lby4nb8ql9txu/debug — memleak -10Gig -2018-08-12.log?dl=0

### Can you reliably reproduce the issue?
#### If so, please list the steps to reproduce below:
1. I don’t know how. I only started Dash-qt and waited for 2 days.
2.
3.

### Expected behaviour
Tell us what should happen

### Actual behaviour
Tell us what happens instead

### Screenshots.
If the issue is related to the GUI, screenshots can be added to this issue via drag & drop.
![dash-qt-memory-leak](https://user-images.githubusercontent.com/1480628/44005123-bde35d66-9e76-11e8-9b24-2bc450e4a7df.png)
![dash-qt-memory-leak-2](https://user-images.githubusercontent.com/1480628/44005124-be09eb5c-9e76-11e8-8477-105985e5dc5a.png)

### What version of Dash Core are you using?
List the version number/commit ID, and if it is an official binary, self compiled or a distribution package such as PPA.

### Machine specs:
— OS: Windows 7 x64
— CPU: Intel Core i7 2600K
— RAM: 20 GB
— Disk size: 256 GB SSD + 16 TB HDDs
— Disk Type (HD/SDD): both, mainly HDD.

### Any extra information that might be useful in the debugging process.
This is normally the contents of a `debug.log` or `config.log` file. Raw text or a link to a pastebin type site are preferred.

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