Add some functions to the File class

[Pirulax]

Is your feature request related to a problem? Please describe.
Partially, because sometimes I just want to rewrite the whole file, so a functions like:
File.readall
File.writeall
And maybe: File.clear

Describe the solution you'd like
Add the mentioned functions.

[Pirulax]

This can be implemented in lua, but it's way faster to do it in c++, because of the time it takes to call an MTA function(3k-12k ms / 10m calls, seems like functions which use argStream.nextIs*() are slower, especially Vector3.create which takes 12k ms / 10m).

[qaisjp]

How frequently are you writing to files, and how large are your files (what are you writing?), that the latency is becoming a problem?

[Pirulax]

I'll write a lot because the way I save the data of my custom interiors.
It's not a problem for now(since the server hasn't opened yet), but it may became a problem after a while.
I'd make the mentioned functions, but I'm lost a little bit with the File class(can't even figure out how it gets it's size 😂)

[ghost]

can you please tell me more about File.writeall? How many parameters will this function take? I'm thinking that we can pass a Lua table to the function, and it writes all the data quickly to the file.

[Pirulax]

Actually, it should be called 'writeAll'
Nah, I thought it should take the same as write, but before writing it should clean the file up, so only the strings passed to it'll be written, or better:
Just merge it with the current 'write' function and add a 'bClear' argument.