Revert #11993: new number format system does not and cannot work for CJK languages

There are too many intricacies that I am unaware of that are popping up after
asking whether things are right or not.
I do not want to keep playing whack-a-mole, so just revert the whole thing.

This reverts:
15be383b934dbf7c876b6d6ffaec7a406c82a39f
360fe8b0b639be9d39bc03a9d5d34123204c14fa
1aa9a5c0abaf9c5d6c49a3a76e2b1d7134c0bd10
59f56941e50bd4ebad31f9e771a4441f647692e5
7e2eefb91ff5999667752eea6e13bd8a0d293f48
b741b2ba6f790891961cb66a9320e75ca168cee4
609d0071d5e6b93aa61688714e9b92cf102e4683
9f8fd80112c188675179c9568a9be84da3df1713
a253205b932cc50fc9f25be390a6aaa370f89a45
819c6c756edd68599571eae126f305d6e3d247fc

Codechange: automatic adding of _t to (u)int types, and WChar to char32_t

for i in `find src -type f|grep -v 3rdparty/fmt|grep -v 3rdparty/catch2|grep -v 3rdparty/opengl|grep -v stdafx.h`; do sed 's/uint16& /uint16 \&/g;s/int8\([ >*),;[]\)/int8_t\1/g;s/int16\([ >*),;[]\)/int16_t\1/g;s/int32\([ >*),;[]\)/int32_t\1/g;s/int64\([ >*),;[]\)/int64_t\1/g;s/ uint32(/ uint32_t(/g;s/_uint8_t/_uint8/;s/Uint8_t/Uint8/;s/ft_int64_t/ft_int64/g;s/uint64$/uint64_t/;s/WChar/char32_t/g;s/char32_t char32_t/char32_t WChar/' -i $i; done

Fix #11054: Prevent translation of currency codes.

Most languages stick with the 3-letter latin currency codes in the name
string, however some translations are... clever... and use the currency
symbol instead. Whilst this may look nice, it can cause issues with fonts
as some scripts have a specific limited set of fonts which do not include
these symbols.

Instead, hard code the currency code list and add it when drawing the
currency name.

Add: Malaysia Ringgit as Currency

Cause why not

*Update the formating

Add: Indonesia Rupiah as in-game currency (#8616)

The exchange rate is actually more like 19,000, but OpenTTD
doesn't handle such high exchange rates kindly.

Codechange: use \u to indicate unicode chars in strings (#8379)

With \x, we sometimes had to do the "" trick, as the length is not
predefined. With C++11 bringing \u to the specs, which has a preset
length, we no longer need the "" trick.

We set the strings to u8, to ensure all compilers use UTF-8 encoding
for the \u characters.

This was triggered by newer CLangs, which start to warn if you
use "" in the middle of a string, wondering if that was your
intention. It is a good question. And this is our answer :)

Add: INR currency (#8136)

Co-authored-by: ilayarja97 <ilayarja97@gmail.com>

Add: Mexican Peso currency

OpenTTD doesn't have any pesos, so I've added Mexican pesos,
at its current exchange rate: 1GBP = 24.39MXN, rounded to 24.

(svn r15409) -Update: Currencies
Remove intermediate currency "New Turkish lira".
Add Euro introduction date for Slovakia.
Remove Euro introduction date for Hungary.

(svn r14595) -Add: Estonian currency.
-Change: Slovenia switched to the Euro in 2007.

(svn r14105) -Fix: Some typos that are more grammatical errors, as it seems.
Provided by ln
I've added a little fix on currency.cpp too, why not :)