Gradle and dependency updates

[TacoTheDank]

1st commit

• Update gradle wrapper to 6.4 using git bash

2nd commit

• Update Studio 3.6.2 -> 3.6.3
• Update buildTools 28.0.3 -> 29.0.3
• Update ndkVersion 21.0.6113669 -> 21.1.6352462 (changelog)
• Grouped dependencies together

3rd commit

• Updated slf4j-api 1.7.29 -> 1.7.30 (changelog)
• Updated EventBus 3.0.0 -> 3.2.0 (changelog)
• Updated OkHttp 4.2.2 -> 4.6.0 (changelog)
• Updated osmosis-osm-binary 0.47 -> 0.48.0 (changelog) (library is unused besides protobuf, but I'd recommend checking to see if something needs to be updated from this)
• Comment out unused Jackson library
• Updated Circle-Progress-View 1.2.9 -> 1.4 (changelog) (check out the new contours)
• Updated taptargetview 1.10.0 -> 1.13.0 (changelog)
• Updated circleimageview 3.0.1 -> 3.1.0 (changelog)
• Updated junit 4.12 -> 4.13 (changelog)

4th commit

• Some miscellaneous code cleanup

[TacoTheDank]

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