Make links on 'About Bitcoin Core' into clickable (squashed 5 comits into one)

Made the following links clickable:
http://www.opensource.org/licenses/mit-license.php
http://www.openssl.org/
eay@cryptsoft.com

(Squashed commits into one commit as suggested by @laanwj)

Replaced label with text browser on About Bitcoin Core Screen

So that the links on the About screen can be clickable

Replaced html property with text property

I have now removed unnecessary html so this should make life easier for
translators and you @Diapolo :). What do you think?

The size of the window needs to change

The size of the window needs to change when you make links clickable.
Thanks  for pointing that out @laanwj

Using the https://www.openssl.org over the http link

Using the https://www.openssl.org over the http link as suggested by
@Diapolo

src/qt/forms/aboutdialog.ui

@@ -110,9 +110,12 @@
         <string>
 This is experimental software.
 
-Distributed under the MIT/X11 software license, see the accompanying file COPYING or http://www.opensource.org/licenses/mit-license.php.
+Distributed under the MIT/X11 software license, see the accompanying file COPYING or &lt;a href=&quot;http://www.opensource.org/licenses/mit-license.php&quot;&gt;http://www.opensource.org/licenses/mit-license.php&lt;/a&gt;.
 
-This product includes software developed by the OpenSSL Project for use in the OpenSSL Toolkit (http://www.openssl.org/) and cryptographic software written by Eric Young (eay@cryptsoft.com) and UPnP software written by Thomas Bernard.</string>
+This product includes software developed by the OpenSSL Project for use in the OpenSSL Toolkit (&lt;a href=&quot;https://www.openssl.org/&quot;&gt;https://www.openssl.org/&lt;/a&gt;) and cryptographic software written by Eric Young (&lt;a href=&quot;mailto:eay@cryptsoft.com&quot;&gt;eay@cryptsoft.com&lt;/a&gt;) and UPnP software written by Thomas Bernard.</string>
+       </property>
+       <property name="textFormat">
+        <enum>Qt::RichText</enum>
        </property>
        <property name="wordWrap">
         <bool>true</bool>