Issue when parsing scientific notation literals

[jchd18]

The runtime parser sometimes fails on reals in scientific notation follo and silently gives a wrong result in some cases.

$x = 1e2 + 10
ConsoleWrite($x & @CRLF)	; 110 OK
$x = (1e2)+10
ConsoleWrite($x & @CRLF)	; 110 OK

$x = 1e2+10
ConsoleWrite($x & @CRLF)	; 100 Wrong!
$x = 1e2-10
ConsoleWrite($x & @CRLF)	; 100 Wrong!
$x = 1e2^10
ConsoleWrite($x & @CRLF)	; 1e+020 Wrong!
$x = 1e2+ 10			; Unable to parse line.
ConsoleWrite($x & @CRLF)
$x = 1e2- 10			; Unable to parse line.
ConsoleWrite($x & @CRLF)
$x = 1e2^ 10			; 1e+020 Wrong!
ConsoleWrite($x & @CRLF)

+, - and ̂ are the only arithmetic operators affected: * and / seem to work correctly. (It was fun composing the exponentiation sign here!)