Wrap Calc functions used by Logarithmic menu.

Preliminary function inventory:

• casual-logarithmic.el: ("l" "𝑙𝑛" calc-ln :transient nil)
• casual-logarithmic.el: ("e" "𝑒^𝑥" calc-exp :transient nil)
• casual-logarithmic.el: ("L" "𝑙𝑜𝑔𝟣𝟢" calc-log10 :transient nil)
• casual-logarithmic.el: ("M-l" "𝑙𝑜𝑔" calc-log :transient nil)
• casual-logarithmic.el: ("M-e" "𝑒^𝑥 - 𝟣" calc-expm1 :transient nil)]