Better explain how escaping symbols works

[Ph0enixKM]

We should explain how we escape symbols in Amber's text and command:

• We handle some symbols with special care
• We handle escape of some symbols with special care
• For other symbols that are escaped we leave it to Bash

match c {
    '"' => match self.render_type {
        InterpolableRenderType::StringLiteral => result += "\\\"",
        InterpolableRenderType::GlobalContext => result.push('"'),
    }
    '$' => match self.render_type {
        InterpolableRenderType::StringLiteral => result.push('$'),
        InterpolableRenderType::GlobalContext => result += "\\$",
    }
    '`' => match self.render_type {
        InterpolableRenderType::StringLiteral => result.push('`'),
        InterpolableRenderType::GlobalContext => result += "\\`",
    }
    '!' => match self.render_type {
        InterpolableRenderType::StringLiteral => result += "\"'!'\"",
        InterpolableRenderType::GlobalContext => result.push('!'),
    }
    '\\' => {
        // Escape symbols
        match chars.peek() {
            Some('\n') => {}
            Some('n') => result.push('\n'),
            Some('t') => result.push('\t'),
            Some('r') => result.push('\r'),
            Some('0') => result.push('\0'),
            Some('{') => result.push('{'),
            Some('$') => result.push('$'),
            Some('\'') => match self.render_type {
                InterpolableRenderType::StringLiteral => result.push('\''),
                InterpolableRenderType::GlobalContext => result += "\\'",
            }
            Some('"') => match self.render_type {
                InterpolableRenderType::StringLiteral => result += "\\\"",
                InterpolableRenderType::GlobalContext => result.push('"'),
            }
            Some('\\') => match self.render_type {
                InterpolableRenderType::StringLiteral => result += "\\\\",
                InterpolableRenderType::GlobalContext => result.push('\\'),
            }
            _ => {
                result.push(c);
                continue;
            }
        }
        chars.next();
    },
    _ => result.push(c)
}