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The current implementation of KSU manager's output screen simply prints `[H[J` when the `clear` command is used (in both the flashing module & action button screen) instead of clearing the screen: <img src="https://github.com/user-attachments/assets/c30ceb87-13ac-4ba6-a7c5-045564e83181" width="300" /> This limits the ability of shell scripts to purely textual & linear outputs, and prevents more flexible outputs such as a refreshing progress bar or even a progress circle for long running scripts. The current implementation moreover limits the output to 65536 bytes for the String `text`, causing the app to hang once this limit has been reached for scripts with more verbose outputs. This PR fixes these issues by allowing for usage of the `clear` command in shell scripts to clear the screen. It works by checking if the current output line starts with "[H[J", which is the default output of the `clear` command in KSU's busybox, and clears the previous outputs if there is a match. This should work universally since the `clear` command defaults to this implementation when ran in KSU manager. A working example can be seen below, where the `clear` command is heavily used (24 times a second) to test for performance & reliability of the code: https://github.com/user-attachments/assets/c45fb6f1-1b40-4b67-8837-4d9a00429715 Tested-by: backslashxx