Enforce code styles with linters

[vidya88]

@olemis commented on Jan 30

Feature description

Normalize code style for clean PR diffs

Is your feature request related to a problem? Please describe.
After analyzing some PR's the corresponding patches sometimes differ on whitespace only.

Describe the solution you'd like
Diffs could have been smaller if code would have been normalized and rules enforced by a linter

Possible implementation

• Choose code style
• Find linters able to enforce that style
• Implement make lint target
• Run make lint in Travis

[vidya88]

@olemis commented on Apr 25

@stdevHan code style should be as close to BTC .clang-format as possible, based on BTC guidelines . Please consider using clang-format and other tools .