Improve formatting of the generated JS code

[DZakh]

• }\ncatch{ -> } catch {
• for(let i = 0 ,i_finish = r.length; i < i_finish; ++i){ -> for (let i = 0, i_finish = r.length; i < i_finish; ++i) {
• while(true) { -> while (true) {
• Fixed tabulation for switch case bodies
• Fixed tabulation for throw new Error bodies
• Removed empty line at the end of switch statement
• Removed empty default case from switch statement in the generated code

[DZakh]

@cknitt It's ready for review

[cknitt]

Awesome! Thanks a lot! 👍