Fix issues with Japanese TypeSplit layouts

[Phidica]

Fixes problems that I described in #567. I made some other adjustments:

• Put ゆ visually on the top of the や key instead of on the right, to match the normal pattern of vowel sounds (I noticed that Gboard does it this way as well). Swiping to the right will still insert ゆ even though it's not visible.
• Removed muted colours from the ま key which seemed to be accidentally left-over from copying the default English layout.
• Put muted colours on the keys that only have punctuation, since this is similar to the use on the English layout. I left the centre symbol as non-muted but I don't really know for sure if it ought to be muted as well.

My logic when rearranging the "shifted" layouts was to make the dakuten/handakuten forms of characters line up with their normal forms whenever possible. With ぱ I preferred to put it close to ば orthogonally rather than diagonally. I moved the ・ and = keys to appear as alternates of the other punctuation, 、 and 。. I moved ゔ to the right side because っ already had to be moved there, and I thought they should stay on the same hand. This just left ¥ to be moved to the top left.

And everything I just said goes the same for the katakana.

Old	New

[dessalines]

cc @K0baU

[dessalines]

Lets let @K0baU see if they agree with the changes. If they're unresponsive after a while, I'll just merge this as is.

[dessalines]

I'll merge now, and we can revert / add separate layouts later if kobau has any objections.

[K0baU]

I agree with your changes. When I create a Japanese layout, I try to follow the logic of its original (English) version. Since Japanese is different from English, this often causes a mismatch. I focus on making Japanese version available and am not fixing problems caused in this way. Problems fixed here are caused as a result of following the rule to put letters in a way similar to qwerty keyboard. For example, in qwerty, we have to type "ba" to input "ば", so I put "ば" where "b" is in qwerty. I did the same to other characters too. I agree that this is not a good idea, but submitted this layout because done is better than perfect. Thank you for improving the layout.

[K0baU]

I clicked "revert" but it is unintended.

[Phidica]

Ah I see, thanks @K0baU!