Added a Negative Sign, Decrement Operator, and Fixed Multiple Bugs in Math Blocks

[BjoernLuig]

Added a Negative Sign, Decrement Operator, and Fixed Multiple Bugs in Math Blocks

Refactored Math Operations:

• Removed the minus sign from single math operations and placed it in a separate block.
• Added a dropdown to the increment operator to enable decrement functionality.

Additional Bug Fixes:

• Resolved compilation errors by replacing Math.PI in trigonometry with M_PI.
• Moved setTooltip() into generators as it does not work with functions (see #381). This is a workaround for know.
• Worked around the absence of Blockly.Generator.Arduino.addInclude(...) and Blockly.Generator.Arduino.addFunction(...) in several cases.
• Updated generators to use the new Blockly.Generator.Arduino.forBlock method.
• Made minor language improvements and additions.
• Enhanced the Tooltip Viewer with a more visually appealing design.
• Reduced warnings in both TooltipViewer and CodeViewer.

[mariopesch]

Looks good! Think there must be a way of updating the tooltip using the block function but as this works right now it should be fine