Fixes and Tests

[GuillermoDylan]

Fixes

Fixed the following problems:

• Validation bug that did not allow processing single DataFrames for movement metrics
• Added missing constants that where hardcoded as text
• Added new checks for testing on pr, only if essential code is actually modified (not documentation)

Tests

Added new tests to validate support of single DF and traces computation (simple validation) to ensure they never break again:

• Movement
  • Velocity
  • Acceleration
  • Jerkiness
• Mouse
  • Fixed mouse metrics to use correct result keys (should refactor with ColumNames in the future)