Add variant selector for "f"

Backers.md

@@ -23,3 +23,4 @@ You can join them in supporting Iosevka development by [pledging on Patreon](htt
 - Winnie Quinn
 - Clemens
 - Pascal
+- Kevin Sidarous

glyphs/letters-unified-basic.ptl

@@ -2680,7 +2680,7 @@ export : define [apply] : begin
 
 		save 'iviby' 0x285
 	define fbar : XH * 0.91 + STROKE * 0.25
-	sketch # f.upright
+	sketch # f.straight
 		local fovershoot2 (O * 2)
 		include markset.b
 		local barleft : [mix SB RIGHTSB 0.35] - STROKE * 0.25 * HVCONTRAST
@@ -2699,19 +2699,19 @@ export : define [apply] : begin
 			flat ([mix SB RIGHTSB 0.02] + HALFSTROKE * TANSLANT) 0
 			curl ([mix SB RIGHTSB 0.875] + HALFSTROKE * TANSLANT) 0
 
-		save 'f.upright'
+		save 'f.straight'
 		save 'lenisf' 0xAB35
 
-	sketch # fltail
+	sketch # tailed
 		include glyphs.'longs.italic' AS_BASE
 		include : dispiro
 			widths.rhs
 			flat (MIDDLE - LONGJUT - HALFSTROKE * TANSLANT) fbar
 			curl (MIDDLE + LONGJUT - HALFSTROKE * TANSLANT) fbar
-		save 'f.italic'
+		save 'f.tailed'
 		save 'fltail' 0x192
 
-	italic-variant 'f' 'f'
+	select-variant 'f' 'f'
 	turned 'turnf' 0x25F 'f' MIDDLE (XH / 2) markset.p
 
 		local shift (-(WIDTH * 0.055 + SB * 0.5))

meta/aesthetics.ptl

@@ -5,7 +5,7 @@ import [mix linreg clamp fallback] from '../support/utils'
 # Parameter generation
 export : define [calculateMetrics para] : begin
 	define UPM 1000
-
+	
 	# Key metrics
 	define WIDTH para.width
 	define SB para.sb

variants.toml

@@ -207,6 +207,14 @@ tag = "cv50"
 one = "serifed"
 tag = "cv51"
 
+[simple.v-f-straight]
+f = "straight"
+tag = "cv52"
+
+[simple.v-f-tailed]
+f = "tailed"
+tag = "cv53"
+
 [simple.others]
 I = 'serifed'
 J = 'serifed'
@@ -237,14 +245,16 @@ upright = [
 	'v-i-serifed',
 	'v-l-serifed',
 	'v-g-doublestorey',
-	'v-y-straight'
+	'v-y-straight',
+	'v-f-straight'
 ]
 italic = [
 	'v-a-singlestorey',
 	'v-i-italic',
 	'v-l-italic',
 	'v-g-singlestorey',
-	'v-y-curly'
+	'v-y-curly',
+	'v-f-tailed'
 ]
 
 [composite.slab]