Psi+ icon/logo/images update

[Neustradamus]

Dear @psi-im team, @psi-plus team, @Ri0n, @Vitozz, @tehnick,

Can you update to good Psi+ icon/logo/images?:

• https://github.com/psi-plus/main/blob/c05684721311ccac64169e93a19f4ffc68201c65/iconsets/system/default/psiplus/psilogo.png
• https://github.com/psi-plus/main/blob/c05684721311ccac64169e93a19f4ffc68201c65/iconsets/system/default/psiplus/psiplus_icon.png
• https://github.com/psi-plus/main/blob/c05684721311ccac64169e93a19f4ffc68201c65/iconsets/system/default/psiplus/psiplus_logo.png
• https://github.com/psi-plus/main/blob/c05684721311ccac64169e93a19f4ffc68201c65/iconsets/system/default/psiplus/logo_128.png
• https://github.com/psi-plus/main/blob/c05684721311ccac64169e93a19f4ffc68201c65/iconsets/system/default/psiplus/logo_16.png
• https://github.com/psi-plus/main/blob/c05684721311ccac64169e93a19f4ffc68201c65/iconsets/system/default/psiplus/logo_32.png
• https://github.com/psi-plus/main/blob/c05684721311ccac64169e93a19f4ffc68201c65/iconsets/system/default/psiplus/logo_64.png
• https://github.com/psi-plus/main/blob/c05684721311ccac64169e93a19f4ffc68201c65/app.ico
• https://psi-im.org/wiki/lib/exe/detail.php?id=main&media=logo_wiki.png

From here:

• https://github.com/psi-im/psi/tree/master/iconsets

With Psi+ icon:

• https://github.com/psi-im/psi/blob/c105f1b6b6214224c03bf904cba7c95b5acc4a92/iconsets/clients/default/psiplus.png

In more, psilogo.png must be updated (in this repository too):

• "Psi Plus" to "Psi+"
• Website to https://psi-im.org/

On the Wiki, the "logo_wiki.png", can be updated more (different to psilogo.png):

• Psi logo
• "Psi Plus" to "Psi"
• Website to https://psi-im.org/

Linked to:

• Psi+ icon/logo/images update psi-im/psi#913
• Psi+ icon/logo/images update #813
• Bad icons of the client (Psi instead of Psi+) #721
• Harmonization of the Psi+ logo #762
• Good Psi+ .doap file #806