✨PROS 4: Make constructors explicit

[ryan-doan]

Summary:

Add "explicit" to devices' constructors.

Motivation:

Prevent implicit copies and conversion of classes.

References (optional):

PROS 4: Rotation Class ctors not explicit #515

Test Plan:

• [Done ] Compile
• [ ] Check for exceptions to explicit and constructors missing explicit
• [ ] pros::Rotation rot = pros::Rotation(1); should be invalid (might be prudent to check every constructors).

[WillXuCodes]

Closing since this is branched off develop, please branch off develop-pros-4