Adds multiple command execution via piping to bevy-console.

Changes:

• Added Parsing to the Command Entrypoint for '|' characters, which split the commands into multiple events.
• Adds the ability to mark Print Statements to be silent
• Saves the last console line for usage in command execution
• WIP: Adds the ability to execute commands silently.
• WIP: Executes commands silently if they are before a '|' character
• WIP: Adds a 'grep'-like command for pattern matching
• WIP: Adds an 'xargs'-like command for executing with last line output.

Solves my own issue: #89