QmlDesigner.PropertyEditor: proper maximum/minimumValues

The default was 0-100. This patch allows a bigger range.

Task-number: QTCREATORBUG-11541
Change-Id: I6b5c29cef1e4706814a9b7cf2d1f2186d7e681c7
Reviewed-by: Marco Bubke <marco.bubke@digia.com>
Environment: Don't search the same directory repeatedly

Do not search the same directory repeatedly when looking for binaries.

Change-Id: I97a722cfa689224cb85cdadfd02e283247f96325
Reviewed-by: Orgad Shaneh <orgads@gmail.com>
Reviewed-by: Daniel Teske <daniel.teske@digia.com>
VcsManager: Add method to get additionalToolsPaths from all IVcsControls

Change-Id: I87910a5a3ccc8e9e00d1b9081ea860832b9fe576
Reviewed-by: Orgad Shaneh <orgads@gmail.com>
VcsManager: Add convenience signal for Vcs config changes

Change-Id: Iac7b80fca94eee428650f0a53af8c2c1c46e6f89
Reviewed-by: Orgad Shaneh <orgads@gmail.com>
Vcs: Use additional tools paths from VCS systems

Use the additional tools installed by VCS tools in the generic
Vcs settings to find patch and ssh-askpass.

Task-number: QTCREATORBUG-11637
Change-Id: Icfd297af56710861316efbe2fec1f4dc440370b2
Reviewed-by: Orgad Shaneh <orgads@gmail.com>
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>