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Add methods for obtaining the scriptext of a string

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Original file line number	Diff line number	Diff line change
`@@ -35,6 +35,12 @@ impl Script {`
`35`	`35`	`}`
`36`	`36`	`}`
`37`	`37`
	`38`	`+implDefaultforScript{`
	`39`	`+fndefault() ->Self{`
	`40`	`+Script::Common`
	`41`	`+}`
	`42`	`+}`
	`43`	`+`
`38`	`44`	`implFrom<char>forScript{`
`39`	`45`	`fnfrom(o:char) ->Self{`
`40`	`46`	`o.script()`
`@@ -76,6 +82,20 @@ impl ScriptExtension {`
`76`	`82`	`pubfnis_empty(self) ->bool{`
`77`	`83`	`self ==ScriptExtension::Single(Script::Unknown)`
`78`	`84`	`}`
	`85`	`+`
	`86`	`+pubfnfor_str(x:&str) ->Self{`
	`87`	`+letmut ext =ScriptExtension::default();`
	`88`	`+for chin x.chars(){`
	`89`	`+ ext.intersect_with(ch.into());`
	`90`	`+}`
	`91`	`+ ext`
	`92`	`+}`
	`93`	`+}`
	`94`	`+`
	`95`	`+implDefaultforScriptExtension{`
	`96`	`+fndefault() ->Self{`
	`97`	`+ScriptExtension::Single(Script::Common)`
	`98`	`+}`
`79`	`99`	`}`
`80`	`100`
`81`	`101`	`implFrom<char>forScriptExtension{`
`@@ -84,6 +104,12 @@ impl From<char> for ScriptExtension {`
`84`	`104`	`}`
`85`	`105`	`}`
`86`	`106`
	`107`	`+implFrom<&'_str>forScriptExtension{`
	`108`	`+fnfrom(o:&'_str) ->Self{`
	`109`	`+Self::for_str(o)`
	`110`	`+}`
	`111`	`+}`
	`112`	`+`
`87`	`113`	/// Extension trait on `char` for calculating script properties
`88`	`114`	`pubtraitUnicodeScript{`
`89`	`115`	`/// Get the script for a given character`

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