Set custom action button color via layout variable

[kriztan]

• Library version: 3.1.1
• Android version: 10
• Support library version: com.google.android.material:material:1.2.1
• Device brand: doesn't matter
• Device model: doesn't matter

Step 3: Describe the problem:

Steps to reproduce:

1. creating a menu via menu.xml
2. use this menu in fab
3. white icons in menu.xml are visible as black icons
4. action button background is not configurable (always uses colorPrimary from theme)

Expected Results:

• set color in layout.xml would be very useful