Add shadow to sidemenu

[MaksymDyomin]

• Add shadow to sidemenu
• Make sidemenu icon size configurable

[teodorpatras]

Hi, thanks for the PR. Have you seen the already implemented function setSideShadow?

[MaksymDyomin]

Hi,
Yes I have seen function setSideShadow. It adds shadow from central panel to side panel. Screenshot is here: https://github.com/MaksymDyomin/SideMenuController/blob/master/screenshots/SideMenuControllerShadow1.png

And it works when side panel is under center panel. For using this function SideMenuController should be configured as following:
SideMenuController.preferences.drawing.sidePanelPosition = .underCenterPanelLeft
SideMenuController.preferences.drawing.centerPanelShadow = true

My pull request adds possibility to configure SideMenuController in different way:
SideMenuController.preferences.drawing.sidePanelPosition = .overCenterPanelLeft
SideMenuController.preferences.drawing.sidePanelShadow = true
This configuration will work if side panel will be over center panel. And shadow will be dropped from side panel to center panel.
Screenshot is here: https://github.com/MaksymDyomin/SideMenuController/blob/master/screenshots/SideMenuControllerShadow2.png

[gulzatique]

is there a way to change icon size? thanks

[MaksymDyomin]

Yes, there is.
You can change hamburger icon size:
SideMenuController.preferences.drawing.menuButtonSize = CGSize(width: 18, height: 12)

[gulzatique]

@MaksymDyomin it says it has no member menuButtonSize

[MaksymDyomin]

@gulzatique please note that this PR have not been merged. Are you sure you using my fork and branch sidemenu-shadow ?