Add clearScreen method

Author: snowak-cb

README.md

@@ -69,6 +69,7 @@ Properties you can pass to the console element
 | log		| (...messages: any)=>void			| Log messages to the console. If string, print the value, otherwise, print the JSON value of the message.
 | logX		| (type: string, ...messages: any)=>void	| Log messages of a particular type to the console. The messages will be given the class `react-console-message-{type}`.
 | return	| ()=>void					| Signal the current command has finished and a new prompt should be displayed.
+| clearScreen	| ()=>void					| Clear the visible log in the console. Does not clear command history.
 
 
 ## Awknoledgements

src/react-console.tsx

@@ -248,8 +248,8 @@ export default class extends React.Component<ConsoleProps,ConsoleState> {
 			70: this.forwardChar,
 			// C-b
 			66: this.backwardChar,
-			// C-l TODO
-			//76: this.clearScreen,
+			// C-l
+			76: this.clearScreen,
 			// C-p
 			80: this.previousHistory,
 			// C-n
@@ -588,6 +588,9 @@ export default class extends React.Component<ConsoleProps,ConsoleState> {
 			}, this.scrollToBottom);
 		}
 	}
+	clearScreen = () => {
+		this.setState({ log: [] });
+	}
 	nonIncrementalReverseSearchHistory = () => {
 		// TODO
 	}