Add proof-related yasnippets

snippets/latex-mode/corollary

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+# -*- mode: snippet -*-
+# name: corollary
+# uuid: corollary
+# key: cor
+# condition: t
+# --
+\begin{corollary}${1:[${2:name}]}
+  $0
+\end{corollary}

snippets/latex-mode/definition

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+# -*- mode: snippet -*-
+# name: definition
+# uuid: definition
+# key: def
+# condition: t
+# --
+\begin{definition}${1:[${2:name}]}
+  $0
+\end{definition}

snippets/latex-mode/lemma

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+# -*- mode: snippet -*-
+# name: lemma
+# uuid: lemma
+# key: lem
+# condition: t
+# --
+\begin{lemma}${1:[${2:name}]}
+  $0
+\end{lemma}

snippets/latex-mode/proof

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+# -*- mode: snippet -*-
+# name: proof
+# uuid: proof
+# key: prf
+# condition: t
+# --
+\begin{proof}${1:[${2:name}]}
+  $0
+\end{proof}

snippets/latex-mode/theorem

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+# -*- mode: snippet -*-
+# name: theorem
+# uuid: theorem
+# key: thm
+# condition: t
+# --
+\begin{theorem}${1:[${2:name}]}
+  $0
+\end{theorem}